Torch



Aug, 16, 1927.

E. F; ENGSTROM ET AL TORCH 2 Sheets-Sheet 2 Filed June 20, 1925 Patented Aug. 16, 1927.

UNITED STATES PATENT OFFICE.

ERNST F. ENGS'I'ROM, or MAYWOOD, AND JAMEsw. BENEs; or HoLLYwooD, ILLINOIS, ASSIGNORS T EVERHOT MANUFACTURING COMPANY, or MAYWOOD, ILLINoIs, A

CORPORATION OF ILLINOIS.

TORCH.

Application filed June 20, 1925. ser l No. 38,432.

This invention relates generally to torches used particularly for heating branding and soldering irons and the like. and has among an adjustable needle valve co-operative with an adjustable Venturi tube for con trolling the passageof air into the combustion chamber.

Another object of this invent-ion resides in the provision of a novel combination shield and priming cup which is formed of a single piece of sheet metal and which not only serves as a protection for the burner from cold air currents, but which affords a v "quicker preheating during the starting op-v eration of the burner.

A further object of my invention resides in the novel construction and arrangement.

of the'vaporizing chamber together with inlet and outlet passages for same and then relative position to thecombustion chamber.

A still further object of the invention resides in thenovel compact construction and arrangement of the burner which 'not' only tends to enhance the efficient operation of same with various grades of fluid, fuels, but

which renders the manufacture of same at a minimum of cost.

With these and other objects in view, my

invention consists in the novel combination construction, andarrangem-ent of'the parts and members shown in the v accompanying drawings. described in the following specifications and particularly pointed out in the appended claims.

Referring to the illustrations; which show one embodiment of my invention, Fig. 1, is

a. side elevation of a torch embodying my invention and having the shield removed to showthe exterior view of the burner.

Fig. 2, is alongit-udinal cross section of i the burner 5 Fig. 8. 1s a cross section taken on line 30f Fig. 1; showing the annular'vapor- -4:-4: of Fig. 1, showing the rear viewof the burner;

Fig.- 5., is a cross section taken on line 55 of Fig. 1', showing'the burner outlet;

Fig 6, is an end elevation of the burner showing the retaining screws and bosses for supporting the burner accessories;

Figures 7 and 8 are respectively longitudinal section and end elevation of my improved combined shield'andpriming cup.

Referring now more particularly to the 50 illustrations in Figures 1 to 6 inclusive, the burner, generally indicated by numeralv 10, comprises a cast metallic tubular wall 11 having a central longitudinally disposed mixing and combustion chamber'12 with an open inlet end 12 and an open outlet end 12?. Near the outlet end 12 1 provide an annular vaporizing chamber 13, which is formed within'the annular wall formation 14:" cast integrally with the combustion 7 chamber wall casing 11. i

Cast integrally with the tubular combustion chamber casing 11. and extending parallelly and longitudinally therewith and on opposite sides thereof, are two tubular casings 15 and 16.

The fuel inlet passage'15 within the easing 15 is in open communication at its forward end with the lower portion of the vaporizing chamber'13 and its rear end is in- 30 teriorly threaded to receive the fuel inlet pipe 17 which communicates with the fuel tank 18. The tank 18 is provided with the usual air pressure pump which is mounted within the tank but since same is not'a part of this invention it is not indicated on the drawing; the projecting pump hand wheel however, being shown and indicated by numeral1'9. I Y

The vaporized fuel passage 16 within the casing '16 is-in open communication at its forward end with the upper portion of the vaporizing chamber 13 and at its rear, end is'interiorly threaded to receive the threaded 'end-QO of a right-angular extension 20 which is formed integrally with the tubular valve stem casing 20. The extension 2O encloses a right angular passage 2O the up- Cal per end of which communicates with the vaporized fuel passage 16 and the lower end with the passage20 having an outlet opening 21 in the plug 21 which is screw mounted into the end of the casing 20. The vaporized fuel discharge opening-21 is controlled by a needle valve 22 which is fixed within the end of the screw threaded stem 23 having anoperating hand .wheel 24. The threads upon-the stem 23 co-operate withthe interior threads of the tubular casing 20. gland nut 25 and suitable packing 26 .provide a tight connection around the stem 23. By turning of the hand wheel 2& a very fine and accurate adjustment of the discharge opening-21 is afforded.

It will be observed from Fig. 2, that the discharge end of the thread plug 21*is located just outside ofthe face ofthe-rear end 12 of the combustion chamber casing 11 and that a Venturi-tube 27 is aligned'therewithand movably supported by means of a set-screw 28 within the end 12? of the combustion chamber 12. The interior of the Venturi tube'27 is formed to gradually converge toward the discharge end. It is now readily apparent that I have provided an adjustably supported Venturi tube which is adjustably movable along the longitudinal axis of the fuel discharge by which the amount of air passing into-the mixing and combustion chamber 12 may be varied to suit the kind and grade of fuel.

7 The front end of theburner is provided with a pair of bosses 29 having openings or recesses 29 adapted to receive the extensions 30 of various blow torch accessories such as a branding iron 31 or soldering tip.

Also the flame emitting end 12 may be provided with screws 32 for retaining accessories with extensions which fit directly into the end 12 The end 12 of'the combustion chamber is also preferably provided 'with'flame emitting radially'disposed openings 12 'which'are located near the outer'wall 14; of the vaporizing chamber 13.

, The wind shield 33 is formed of one piece of" sheet metal having substantially flat sides 33 with a depression 33 in the bottom forming a priming'cup adapted toreceivea quantity of fuel through anopening3 in the'bottom of the combustion chamber near the end'of-the Venturi tube 27 for preheating of the burner preliminary to starting op eration. 'Tlie'top' ofthe shield 33 is open as 33 andthe end top portions are overlapped as at33 and either riveted-or-welded together at this point.

The vaporized fuel passage 20 and the vaporizing chamber 13 areprovided with openings to permitcleaning of same, which openings are normally closed :by threaded plugs respectively lindicated by numerals 35 and 36.

stem 23 or injuring the needle by over The clean out plug 35 serves also to support the upper rear end of the wind shield 33 and the plug 36 is adapted to receive a screw 37 which rigidly supports the lower front end of the shield 33 between the plug 36 and the torch support 38 which is made of a bent flat bar to form legs 38 From the, above description and the attached illustrations-it will be apparent that the ,fuel is passed under compression from the tank '18 through the pipe '1'7-and passage 15 into the vaporizing'chamber 13 where it is thoroughly vaporized and then passed .into the return passage 16 and through the passage 20 for discharge through the needle valve controlled opening .21 through the Venturi tube 27 into the combustion chamber 12. As above stated the relative position of the Venturi tube 27 along the longitudinal the integral tubular members 15 and .16 due iotheir proximityto the combustion chamber will materially tend to increase the vaporization of the fuel .preliminaryto its discharge into the combustion chamber 12.

The :hand wheel 2st for vthe fuel needle valve comprisesa circular rim 24 having a single integrally cast spoke 24L? terminating at the hub 24 also casteintegrally with the arm or spoke 24?. It will be observed'that the fuel inlet pipe .17 extends throughthe annularopening 24 of thehand wheel for .the purpose of presenting a positive stop 'for "the .hand wheel 24: when the spoke or arm 24 .engages the side thereof,.thus positively preventing over tightening of the needle valve in closing position. This arrangement overcomes the possibility of stripping the threads on the needle valve tightening which often occurs when a positive stop is-not provided. A nut 24 is ,provided on the end of the ,stem 23 to retainthe handle 24: thereto.

Due to thesingle spoke construction less heat is-conducted from :the stemto rim to wheel making acooler handling valve wheel 24. g

I claim:

1.In-a torch of the character described, and incombinatioin aburner for said torch adaptedto receive fluid fuel under pressure, saidburnerhaving a combustion chamber, a shield rigidlysu-pportedon saidburner and embracing said combustion chamber, said combustion chamber having a fluid fuel outlet, and a priming cup depressed .in said shield adapted to receive ,fluid fuel from said (outlet for preheatingof said burner and combustion chamber.

2. In a blow torch, and in combination, a priming cup depressed in the bottom of said burner for said torch having a combustion shield adapted to receive fluid fuel from chamber and a fluid fuel vaporizing chamsaid outlet for preheating of said burner. her, a shield supported on said burner and In witness whereof We afiix our signatures.

5 embracing said combustion chamber and said vaporizing chamber, said combustion v E. F. ENGSTROM. chamber having a fluid fuel outlet, and a 7 JAMES WQBENES. 

